<!DOCTYPE html>

<style>
  @font-face {
    font-family: ExTest;
    src: url(../css-values/resources/ExTest.woff);
  }
  :root {
    font-family: ExTest;
    font-size: 20px;
  }
</style>

<p style="font-family: sans-serif">The following two lines should look exactly the same.</p>

<div style="font-size: 1ex;">
  <div style="font-family: sans-serif;">
    Text.
  </div>

  <div style="font-family: sans-serif;">
    Text.
  </div>
</div>
